Five grammes (75 grains) Anthion are dissolved in one litre (one quart) of luke-warm distilled water. The solution keeps for at least one month.
A. For Gelatine Plates.
a. The plate (13 × 18 centimetres—5 × 7 inches) or film, after fixing, is allowed to drain and then washed for about five minutes in a dish with about 600 cubic centimetres (20 fluid ounces) water; it is then again allowed to drain.
b. Afterward it is laid in a second dish with 200 c.c. (7 fluid ounces) Anthion solution, and again allowed to remain for five minutes with occasional stirring.
c. The plate is then once more laid in 600 c.c. (20 fluid ounces) fresh water, exactly according to direction a.
d. The operations b and c are repeated.
The plate is then free from fixing soda. (In order to determine this, proceed as follows:)
Test.
To be certain that all the fixing soda is completely destroyed, proceed as follows: Several c.c. (half to one teaspoonful) of the last washing water are poured into a test-tube, and three or four drops silver nitrate solution (1 to 20) added. A white precipitate generally forms. If this gradually acquires a yellow tint, fixing soda is still present.
In such a case operations a and b are to be repeated.